Damper.



No. 723,372 1 v PATENTED MAR. 24, 1903.. 0.,A. DUNE-AR.

DAMPER.

APPLICATION FILED AUG. 12, 1902.

.NO MODEL. 4 SHEETS-SHEET 1- WITNESSES: lNVENTOR 44a Uharlas :UunBarATTORNEY PATENTED MAR. 24;, 1903.

0. A. DUNBAR.

DAMPER. APPLIGATIUN FILED AUG. 12, 1902.

4 SHEETSSHEET 2.

H0 MODEL.

INVENTOR WITNESSES:

qw g vm am-Lu (Mf No. 723,372. PATBNTED MAR. 24, 1903.

- C. DUNBAR.

DAMPER.

APPLICATION FILED AUG. 12, 1902.

.NO MODEL. 4 SHEETS-SHEET a.

WITNESSES: INVENTOR'. & Char]. as almun baz' 36 BY ONLLQ. 6' H 154mm cf/ATTORNE No. 723,372. PATENTED MAR. 24, 1903. C. A. DUNBAR.

DAMPER.

APPLICATION 'IiLED' AUG. 12, 1902.

N0 MODEL. 4 SHEETS-SHEET 4.

WITNESSES: *mvEN Tm n ljha rlagajjun bar UNITED STATES P TENT OFFICE.

CHARLES A. DUNBAR, OF NEWARK, NEW'JERSEY.

DA-M PER.

srncmzcmnon forming peace Letters Patent No. 723.372, elated March24,1903.

Application filed August 1 2, 19oz,

T0 at whom it may concern:

Be it known that I, CHARLES A. DUNBAR, a citizen of the United States,residin g at Newark, in the county of Essex and State of New will enableothers skilled in the art to which it appertains to make and use thesame, reference being had to the accompanying draw ings, and to numeralsof reference marked thereon, which form apart of this specification. V

The present-invention relates to improvements in dampers for furnaces;andthe invention has reference more particularly to a novel arrangementand construction of the parts of a damper-arranged in the smoke pipe orflue which is connected with the furnace with a View of providing aproper consumption of the gases which sometimes lodge and collect in theflue or pipe, especially when the damper is partly closed to check thedraft;

furthermore, to provide in connection with a damper construction of thecharacter tobe hereinafter fully set forth an indirect draft for apassage or flow of air into the smoke-flue when there is an excessivedraft upon the chimney during high winds, to prevent a direct draft uponthe body of fire in the furnace when the said fire is to be checked,especially during the night, and to prevent the said body of fire fromburning outbefore morning. V

My present invention has, therefore, for-its principal objects toprovide a novel construction of damper and check for furnaces whichshall be of a cheap and very simple construction, shall be veryeffective in its operation, and in which the means for admitting theoutside air into the damper-casing directly back of the damper in saidcasing for the consumption of the gases to prevent an explosion or backdraft in the furnace is controlled and regulated by the same movement ofthe handle or lever for operating and setting the.

damper.

The invention has for its further object to provide,'iu connection witha damper of the character just set forth, a novel means fordrawingtheoutsideairdirectlyintothesmoke- Serial No- 119,371. on modeldpipe in front of the damper when the latter is partly or entirely closedor set for checking theiire in the furnace, and thereby providing anindir'ect draft into and through the smokeflue when there is anexcessive draft or suction upon the chimney to which the smokeline ofthe furnace leads, as during high winds and storms, but when a fulldraft is Wanted the damper in the casing being of such arrangement thatit will entirely close the opening leadingfrom the gate-valve-controlledopening of that portion of the device through which the outside airflows when such indirect draft is desired.

Other objects of this invention not at this time more particularlymentioned will be clearly evident from the following detaileddescription of my invention.

My iuvention'therefore consists in the novel construction of damper andcheck for the flues of furnaces; .andffurthermore, this inventionconsists in the various novel arrangements and combinations of parts,all of which will be more particularly set forth in the 'followingspecification and then finally embodied in the clauses of the claimwhich are appended to and form a part of this specification.

The invention is clearly illustrated in the accompanying drawings, inwhich- Figure l is aside elevation, and Fig. 2isa longitudinal verticalsection, of a damper or check for smoke-fl'ues embodying the principlesof the present invention, the damper plate or disk being represe'nted'inits closed position in the damper-casing. Fig. 3 is a side elevation,and Fig. 4 is a longitudinal vertical section, of the damper or checkrepresented in said Figs. 1 and 2, but illustrating the damperplate ordisk in thedamper-casing in its opened position to permit a direct draftthrough the device and preventing an indirect draft'therethrough. Figs.5 and 6 are the two end views of the damper or check. Fig. 7 is ahorizontal section of the same, said section being taken on line 7 7 insaid Fig. 2.

Fig. 8 is a vertical cross-section taken on line 8 8 in said Fig. l, andFig. 9 is a vertical cross-section taken on line 9 9 in said Fig. 1.Fig. 10 is a side elevation of the device, similar to that representedin Fig. 1, but a portion of the damper-casing being broken away.

Fig. 11 is a side elevation, and Fig. 12 a longitudinal verticalsection, of a modified arrangement of the gate-valvefor the indirectdraft through the damper-casing when the latter is to-be arranged in avertical position in the smoke-flue of the furnace.

Similar characters of reference are employed in all of the saidhereinaoove-described views to indicate corresponding parts.

Referring now to the said drawings, the reference character 1 indicatesthe complete casing in which the damper is arranged. This casingcomprises a main body portion 2, of a cylindrical cross-section,provided with the inlet 3 and the outlet4 for arranging and securing thesaid casing in the furnace-flue or smoke-pipe in any well-known manner,as will be clearly understood. Connected with the lower portion of saidmain body 2 by means of a suitable opening 5 is a box 6, having thesides 7, a bottom 8, the upwardly-extending back 9, and the front 10,which is provided with an opening 11. The said front is also providedwith a pair of perforated ears or lugs 12, in which there is a pin 13,carrying an oscillating door or gate 14. This gate or door 14 is hung,by means of perforated ears orlugs 15, in such manner from the said pin13 that its lower edge is normally in close engagement with the inneredge of an upwardly-extending portion 16' of the said box 6, as clearlyillustrated in Figs. 2 and 4 of the drawings. The said main body 2 isalso provided near its inlet 3 and at that part of the opening 5 nearestthe said inlet 3 with the cylindrical portion-17, with the walls orpartitions 18 and 19, and a horizontally-disposed bottom 20, so as toform a duct or passage-way 21. The said bottom also extends rearwardlyand is connected with a vertical wall or partition 22, which is securedat its ends to the inner surface of the said main body portion 2directly above the'edge 23, as shown, to form a duct or passage-Way 24.This duct or passage-way 24 is covered by means of a plate 25, providedwith any suitable number of holes or perforations 26, sub stantially asand for the purposes to be presently more fully set forth. tion isestablished between the duct or passage-way 21 and the duct orpassage-way 24 by means of an opening 27 in the partition 19, as shownin Figs. 2 and 4. In one or both of the opposite sides 7 of the box 6 isa suitably -shaped opening or openings 28, which when open permit of afree circulation of fresh air into the duct or passageway 21 through theopening 27 in the partition 19, into the duct or passage-way 24, and.thence through the perforations 26 in the plate and also through theopen spaces 29 at the top edges of said plate 25 (see Fig. 8) into theinterior of the said main body portion 2, where said fresh aircommingles with the gases coming from the furnace to produce combustionof the same, and therebypreventing aback draft or an explosion in thefurnace A communicaby the collection ofsuch gases,as will be clearlyevident. When a full draft is on the fire in the furnace, the opening 5between the interior of the said main body portion 2 and the box 6 isclosed by means of a suitably-com structed damper or plate 30,preferably made scoop-shaped, as shown, so as to more properly close thesaid opening 5. This damper or plate 30 is suitably secured along itsedges 31 to a spindle or rod 32, jonrnaled in suitable hearings in theopposite sides 7 of the box 6, and its ends extend beyond the saidsides, as shown. Suitably connected with and secured upon one or both ofthe said projecting ends of the said spindle or rod 32 are one or twoarms 33, each arm having at its free end the disk-shapedand flat member34. Upon one or both of the said projecting ends of the said spindle orrod 32 may also besuitably secured a lever or handle 35 for setting thedamper or plate at any desired degree of inclination within the mainbody portion 2. The lower end portion of the said lever or handle 35 isin slidable and frictional engagement with a suitable guard 36 at theside of the box, the same being preferably provided with the words Shutand Open. This frictional engagement between these parts allows of thesetting of the damper or plate 30 at any angle, and at which angle thesaid damper or plate will be held until moved into another position bythe manipulation of the said handle or lever 35.

From an inspection of Figs. 3 and 4 it will be. clearly evident thatwhen the damper or plate 30 has been set in its entirely-open positionfor a full draft the rotary movement of the spindle or rod 32 will havemoved the arm or arms 33 and the flat member or members 34 directly overthe opening or openings 28 in the side or' sides 7 of the box 6, therebyentirely closing the said openings. When, however, the said damper orplate 30 has been set at, any intermediate position between ShutandOpenordirectlyuponOpen, then the said arms .33 and members 34 will be inthe positions that said members 34 are not directly over the opening oropenings 28, thereby leaving the opening or openings 28 open for a freecirculation of air into the ducts or passage-ways 21 and 24 and theinterior of the main body portion 2 directly above the perforated plate25, as hereinabove set forth, and for the proper consumption of thegases from the furnace that might otherwise collect in front of thedamper or plate 30 and perhaps cause an explosion in the furnace.

The purpose of the oscillating door or gate 14, previously mentioned, isas follows: It often happens that during the night when the damper orplate 30 is partially closed to check the fire in the furnace a highwind causes a suction in the chimney-flue with which the smoke-pipe ofthe furnaceis connected, whereby too great a draft upon the fire isproduced, and hence there will be too great a consumption of coal duringthe night,

rangement of the box 6, connected with the interior of the main bodyportion 2, by producing an indirect draft directly through the interiorof the said box 6 and through the opening 5 into the interior of themain body portion 2, as will be clearly understood from an inspection ofFig. 2, without in the least having any efiect upon the checked fire inthe The said gate or door 14 is made of furnace. such light metal, ascopper or aluminium, that it readily oscillates or vibrates with thechanges of the wind, causing a suction of air t'hroughthes'e parts ofthe device and the chimney-flue.

In some instances it may be necessary to arrange the damper device in averticallyplaced smoke-flue. In that case the device is set as indicatedin Figs. 11 and 12 of the drawings, and a gate or door 37 is pivotallyarranged behind an opening 39 inthe vertical side 38 of the box 6, asillustrated. The

remaining parts of the device are arranged.

and act as hereinabove described, and no further description of theseparts is therefore necessary.

From the hereinabove description of my damper and checking device forfurnaces it will be clearly evident that I have provided asimply-constructed and an efliciently-oper--. 'ating attachment whichcan be readily connected up in any flue or smoke-pipe of a furmace, andthe various parts of the device all being made either of cast metal inone piece or of sheet metal they can be readily connected by beingsoldered together in the usual and well-known manner.

I am aware that changes may be made in the various arrangements andcombinations of the parts, as well as in the details of the constructionthereof, without departing from the scope of my present invention. HenceI do not limit my invention to the exact arrangements and combinationsof the various parts as described in the previous specification, and asillustrated in the corresponding drawings, nor do I confine myself tothedetails of the construction of any of the parts thereof.

Having thus described my invention, what I claim is- 1. In a damper, thecombination, with a main body provided with an opening in its side, andadamper-plate jo'urnaled near one edge of said opening and arranged toopen into the main body, and mechanism cooperating with and moving inunison with the damper-plate to close said means of ingress when thedamper-plate is open and to open said means of ingress when thedamper-plate is closed, substantiallyas and for the purposes set forth.

2. In a damper, the combination, with a main body provided with anopening in its side, and a damper-plate journaled near one edge of saidopening and arranged to open and close said opening and simultaneouslyclose and open the interior of said main body with a smoke-flue in whichthe damper is arranged, a box having an air-duct directly beneath thelower front end portion of the said main body and said box inclosingsaid open ing in the main body, said box being provided with a means ofingress for the passage of air into the interior of the said air-duct, ameans of communi'cation'for the passage of the air from said air-ductinto the interior of the said main body, a perforated plate arrangeddirectly above the said means of communication, and mechanismcooperating with and moving in unison with the damper-plate to closesaid means of ingress to the air-duct when the damper-plate is open andto open said means of ingress when the damper-plate is closed,substantially as and for the purposes set forth.

3. In a damper, the combination, with a main body, and a damper-plate insaid body for opening and closing the interior of said main body with asmoke-fine in which the damper is arranged, downwardly-extendingpartitions near the front end portion of said main body, a horizontalwall connecting the saiddownwardly-extending partitions, so as toprovide a pair of air-ducts, one of said.

downwardly-extending partitions being provided with an opening toprovide a means of communication for the air from one air-duct into theother air-duct and into the interior of the said main body, a means ofingress for the passage of the air from the outside into the air-ductnearest the front end of the said main body, and mechanism cooperatingwith and moving in unison with the damper-plate to close said meansofingress when the damper-plate is open and to open said means ofingress when the damper-plate is closed, substantially as and for thepurposes set forth.

4. In a damper, the combination, with a main body and a damper-plate insaid body for opening and closing the interior of said main body with asmoke-flue in which the damper is arranged, downwardly-extendingpartitions near the front end portion of said main body, a horizontalwall connecting the said downwardly-extending partitions, so asto'provide a pair of air-ducts, one of said downwardly-extendingpartitions being provided with an opening to provide a means ofcommunication for the air from one air-duct into the other air-duct, ameans of communi- 'rior of said main body, a perforated plate ar-;

moving in unison with the damper-plate to; close said means ofingresswhen the damperplate is open and to open said means of ingress when thedamper-plate is closed, substantially as and for the purposes set forth.

5. In a damper, the combination, with a.

main body provided with an opening in its side, and a damper-platejournaled near one edge of said opening and arranged to openand closesaid opening and simultaneously close and open the interior of said mainbody with a smoke-flue in which the damper is arranged, a box having anair-duct directly beneath the lower front end portion of the said mainbody and said box inclosing said opening in the main body, said boxbeing provided with a means of ingress for the passage of air into theinterior of said air-duct and thence, into the main body, and mechanismcooperating with and moving in unison with the damper-plate to closesaid means of ingress when the damper-plate is open and to open saidmeans of ingress when the damper-plate is closed, consisting,essentially, of a lever 35 on the end of the spindle to which the damperplate is attached, an arm 33 also secured on said spindle, and a fiatdisk-like member 34 on said arm 33, adapted to be,moved over the saidmeans of ingress, substantially as and for the purposes set forth.

6. In a damper, the combination, with a main body and a damper-plate insaid body for opening and closing the interior of said main body with asmoke-flue in which the damper is arranged, downwardly-extendingpartitions near the front end portions of said main body, a horizontalwall connecting the said downwardly-extending partitions, so as toprovide a pair of air-ducts, one of said downwardly-extending partitionsbeing provided with an opening to provide a means of communication forthe air from one air-duct into the other air-duct, and into the interiorof the said main body, a means of ingress for the passage of the airfrom the outside into the air-duct nearest the front end of the saidmain body, and mechanism cooperating with and moving in unison with'thedamper-plate to close said means of ingress when the dam perplate isopen, and to open said means of ingross when said damper-plate isclosed, consisting essentially, of a lever 35 on the end of the spindleto which the damper-plate is attached, an arm 33 also secured on saidspindie, and a flat disk-like member 34 on said arm 33, adapted to bemoved over the said means of ingress, substantially as and for thepurposes set forth.

7. In a damper, the combination, with a main body provided in its sidewith an opening forming a means of ingress for the air into the interiorof said body, of a box connected with said main body, said box inclosingthe-opening in said main body, a rod journaled inithe' opposite sides ofsaid box, said box being provided with an opening 28 in its side, adamper-plate attached to said rod, an 7 arm secured on the free end ofsaid rod and extending at a right angle along the side of the said box,and a flat disk-like member 34 on said rod 33 adapted to be moved overthe opening in the side of the said box, substantially as and for thepurposes set forth.

8. In a damper, the combination, with a main body provided in its sidewith an opening forming a means of ingress for the airinto the interiorof said body, of a box connected with said main body, said box inolosingthe opening in said main body, a rod journaled in the opposite sides ofsaid box, said box being provided with an opening 28 in its side, adamper-plate attached to said rod, an arm 33 secured on the free end ofsaid rod and extending at a right angle along the side of the said box,and a fiat disk-like'member 34 on said rod adapted to be moved over theopening in the side of the said box, and a lever 35 also secured on thefree end of said rod, sub stantially as and for the purposes set forth.

9. A damper for furnaces, comprising a casing, consisting, essentially,of a main body portion 2, a damper-plate in said main body for openingand closing the interior of said main body, and a box 6 connected withsaid main body and having a means of communication between them, thesaid box being provided with an opening, an oscillating gate adapted toopen and close said opening by an indirect draft, an air-duct arrangedbetween the lower front end portion of the said main body and the upperpart of the said box, a means of ingress in the side of said box for thepassage of air into the interior of said airduct and thence into themain body portion, and mechanism cooperating with and moving in unisonwith the damper-plate to close said means of ingress when thedamper-plate is open and open the said means of ingress when thedamper-plate is closed, substantially as and for the purposes set forth.

10. A damper, for furnaces, comprising, a casing consisting,essentially, of a main body portion 2, a damper -plate in said body foropening and closing the interior of said main body, and a box 6connected with said main body and having a means of communicationbetween them, the said box being provided with an opening, anoscillating gate adapted to open and close said opening by an indirectdraft,an air-duct arranged between the lower front end portion of thesaid main body and the upper part of said box, a means of ingress in theside of said box for the passage of air into the interior of saidair-duct, a means of communication for the passage of the air from saidair-duct into the interior of said main body, a perforated platearranged directly above the said means of communication, and

mechanism cooperating with and moving in unison with the damper plate toclose said means of ingress to the air-duct when the damper-plate isopen and to open said means of ingress when the damper-plate is closed,substantially as and for the purposes set forth. I

11. A damper for furnaces, comprising, a casing, consisting,essentially, of a main body portion 2,a damper-plate in said bodyportion, and a box 6 connected with said main body portion and havingameans of communication between them, the said box being provided with anoscillating gate adapted to open and close said opening by an indirectdraft, downwardly-extending partitions extending from near the front endportion of the said main body into the said box, a horizontal wallconnecting the said downwardly-extending partitions, so as to provide apair of air-ducts, one of said downwardly-extending partitions beingprovided with an opening to provide a means of communication for the airfrom one air-duct into the other air-duct and into the interior of themain bodyportion, a means of ingress for the passage of the air from theoutside into the air-duct nearest the front end of the said main bodyportion,and mechanism cooperating with and moving in unison with thedamperplate to close said means of ingress when the damper-plate is openand to open said means of ingress when the damper-plate isclosed,substantially as and for the purposes set forth.

12. A damper for furnaces, comprising, a casing, consisting,essentially, of a main body portion 2,a damper-platein said bodyportion, and a box 6 connected with said main body portion and having ameans of communication between them, the said box being provided with anopening, an oscillating gate adapted to open and close said opening byan indirect draft, downwardly-extending partitions extending from apoint near the front end portion of the said main body into the saidbox, a horizontal wall connecting the said downwardly-extendingpartitions, so as to provide a pair of air-ducts, one of saiddownwardlyextending partitions being provided with an opening to providea means of communication for the air from one air-duct into the otherairduct, a means of communication from the latter air-duct into theinterior of said main body portion, a perforated plate arranged directlyabove the said means of communication, a means of ingress for thepassage of the air from the outside into the air-duct nearest thefrontend of the said main body portion, and mechanism cooperating withand moving in unison with the damperplate,to close said means of ingresswhen the damper-plate is open and to open said means of ingress when thedamper-plate is closed, substantially as and for the purposes set forth.

In testimony that I claim the invention set forth above I have hereuntoset my hand this 8th day of August, 1902.

CHARLES A. DUNBAR.

Witnesses:

FREDK. C. FRAENTZEL, GEO. D. RICHARDS.

